Gwen Stefani's ex-husband Gavin Rossdale is incredibly private about his personal life but delighted fans on Valentine's Day after sharing a romantic photo to mark the occasion.MORE: Gwen Stefani receives massive gift from Blake SheltonThe Bush frontman took to Instagram to share a polaroid picture of himself posing with a bunch of roses.The picture was liked over 4,000 times, with the star's son Kingston one of the first to do so.Gavin's fans were quick to comment on the sweet snapshot too,